Journal
OPTICAL AND IR TELESCOPE INSTRUMENTATION AND DETECTORS, PTS 1 AND 2
Volume 4008, Issue -, Pages 999-1009Publisher
SPIE-INT SOC OPTICAL ENGINEERING
DOI: 10.1117/12.395468
Keywords
infrared cameras; infrared instrumentation; wide-field imaging; SWIR; near-infrared; cryogenic flex circuits
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The CFHTIR is a large format (1kx1k)near infrared (1-2.4um) camera based on the Rockwell HAWAII Array. CFHTIR is designed for both direct imaging at the f/8 Cassegrain focus, as well as spectroscopy on the OSIS multiobject spectrograph. The camera provides 0.21/pixel sampling in both applications with a single set cold transfer optics and pupil mask. The camera includes two eight-position filterwheels driven by cryogenic stepper motors with position control using a novel Hall effect sensor technique. CFHTIR also uses a novel dewar wiring technique employing flexible circuit vacuum feedthrus. CFHTIR is the second large format infrared camera based on the Hawaii array constructed at CFHT, the first being the KIR camera for the CFHT Adaptive Optics Bonnette which was commissioned in 1997. This paper describes the system architecture of the CFHTIR highlighting key design concepts and detailing the physical elements.
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